Lock Nut

Ensure optimal performance and safety with the Case Construction Lock Nut #88871. Designed for heavy equipment, this durable lock nut provides secure fastening, preventing loosening under vibration. Perfect for maintaining the integrity of your machinery on any job site.

Compatible equipment

This part fits CASE CRAWLER TRACTOR, CASE TRIMLINE TRENCHER, COMPACT WHEEL LOADER TIER 3, COMPACT WHEEL LOADER STD, TC, COMPACT WHEEL LOADER STD, ZB, SERIES - CASE UNI-LOADER SKID STEER LOADER, CASE UNI-LOADER SKID STEER LOADER, COMPACT WHEEL LOADER HS, ZB, COMPACT WHEEL LOADER HSP, ZB, COMPACT WHEEL LOADER STD EVO, ZB, CASE TERRATRAC CRAWLER TRACTOR, BACKHOE, LOADER, CASE SKID KING WHEEL LOADER, BACKHOE FOR W7, W9A, W9B, W10, COMPACT WHEEL LOADER HPS EVO, XR, COMPACT WHEEL LOADER HSP EVO, ZB, COMPACT WHEEL LOADER STD, XR, BACKHOE FOR 310G AND 450 CRAWLER, BACKHOE FOR CRAWLER MODELS 750, 850, 1150, BACKHOE FOR W SERIES RIGID LOADERS, BACKHOES FOR CRAWLER MODELS 750, 850, 1150, BACKHOE FOR 450, 450B, 850, 850B, AND W14, LOADER AND BACKHOE FOR 580CK SERIES B, CASE TRENCHER, CASE SKID STEER LOADER, SKID STEER - 410 NA BSN N7M480924, 410 EU BSN N7M468736, SKID STEER - SERIES 3, 410 NA ASN N7M480924, 410 EU ASN N7M468736, INTERNATIONAL HARVESTER COMPACT LOADER, SKID STEER - 420NA BSN N7M466710, 420EU BSN N8M466713, COMPACT TRACK LOADER - BSN N7M455401, COMPACT TRACK LOADER - SERIES 3, ASN N7M455401, COMPACT WHEEL LOADER HS, ZB - STAGE V, SKID STEER - BSN N7M425032, SKID STEER - BSN N7M454787, COMPACT TRACK LOADER - BSN N8M458846, SKID STEER, TIER 2, P.I.N. N7M458414 & PRIOR, CASE LONG TRACK CRAWLER TRACTOR, COMPACT TRACK LOADER - BSN N7M464019, SKID STEER BSN N7M452623, CASE CONSTRUCTION KING LOADER BACKHOE, CASE LOAD KING WHEEL LOADER, IND - CASE CRAWLER TRACTOR, LOADER LANDSCAPER - LIVERY, LOADER LANDSCAPER, LOADER LANDSCAPER - TIER 4A ASN NCC570600, TRACTOR LOADER BACKHOE, BACKHOE LOADER, CASE CONSTRUCTION KING TRACTOR W/SHUTTLE TRANSMISSION, CASE CONSTRUCTION KING WHEEL TRACTOR W/HYDROSTATIC TRANSMISSION, ELECTRIC FOUR WHEEL DRIVE, CASE CONSTRUCTION KING LOADER BACKHOE - 4WD SUPPLEMENT, CASE CONSTRUCTION KING LOADER BACKHOE - TURBO SUPPLEMENT, BACKHOE LOADER - TIER 4A - FROM PIN NCC560000, BACKHOE LOADER, 2WD - TIER 4B - MY18, BACKHOE LOADER, 2WD - TIER 4B - MY19, BACKHOE LOADER, 4WD - TIER 4B - MY18, BACKHOE LOADER, 4WD - TIER 4B - MY19, CASE SUPER-D CONSTRUCTION KING LOADER BACKHOE, CASE SUPER-E CONSTRUCTION KING LOADER BACKHOE, BACKHOE LOADER - TIER 4A - FROM PIN NCC564000, LOADER BACKHOE, BACKHOE LOADER - WIDE TRACK, BACKHOE LOADER, 4WD - WIDE TRACK - TIER 4B - MY18, BACKHOE LOADER, 4WD - WIDE TRACK - TIER 4B - MY19, BACKHOE LOADER, WIDE TRACK, BACKHOE LOADER, SIDE SHIFT, TOOL CARRIER, 4WD - TIER 4B - MY22, FORKLIFT - LIVERY, FORKLIFT, CASE TURBO HORIZONTAL DIRECTIONAL DRILLING MACHINE, 4WD MOTOR GRADER ELECTRO-HYDRAULIC - STAGE V, 4WD MOTOR GRADER MY20 - STAGE V, 6WD MOTOR GRADER ELECTRO-HYDRAULIC - STAGE V, AWD MOTOR GRADER MY20 - STAGE V, MOTOR GRADER - ASN 020001, MOTOR GRADER TIER 2- BTW 020101-020187, CASE TURBO TRENCHER, MOTOR GRADER - ASN 022001, MOTOR GRADER TIER 2 - ASN 022101, MOTOR GRADER - ASN N5AF04007, MOTOR GRADER - ASN 024001, MOTOR GRADER TIER 2 - BTW 024102-024129, CRUSHER, HYDRA-BORER, MAXI-SNEAKER CABLE LAYER, SERIES-B MAXI-SNEAKER CABLE LAYER, SERIES-B MINI-SNEAKER CABLE LAYER, COMPACT WHEEL LOADER STD, ELECTRIC, ZB, CRAWLER EXCAVATOR TIER 3, MINI CRAWLER EXCAVATOR, CAB, CASE BACKHOE, FLEETLINE 16+4 TRENCHER, MINOTAUR COMPACT DOZER LOADER, ISM ENGINE, SNEAKER - SERIES-C TRENCHER, SNEAKER C - 25+4XP TRENCHER, ENGINE, DAVIS FLEETLINE 30+4 TRENCHER, DAVIS FLEETLINE 40+4 TRENCHER, SMALL ARTICULATED LOADER, SKID STEER LOADER, SKID STEER LOADER - NRC, SKID STEER LOADER - TIER 3 - ROW, SKID STEER LOADER - TIER 4F - NA, VIBRATORY ROLLER, SKID STEER ENGINE - 844T, SKID STEER LOADER - S5 NA, REGULATED NA - TIER 4 - MY26, VIBRATORY ROLLER TIER 1, SINGLE DRUM COMPACTOR, SKID STEER LOADER TIER 4, REGULATED NA, TIER 4 - MY26, SV340B-RGV-AP, MINI TRACK LOADER 1000 - STAGE V, COMPACT TRACK LOADER, COMPACT TRACK LOADER - NRC, COMPACT TRACK LOADER - TIER 3 - ROW, COMPACT TRACK LOADER - TIER 4F - NA, CASE UNIT LOADER, CASE WHEEL LOADER W/POD CAB - NEW YORK STATE SPECIAL, CASE ARTICULATED WHEEL LOADER, CASE WHEEL LOADER, CASE FORKLIFT including models 1150B, 1150D, 1150E, 1150G, 1155D, 1155E, 120, 121E SERIES 3, 121F, 1450, 1450B, 1455B, 1550, 1700, 1816, 1816C, 1818, 1825B, 1835, 1835C, 1838, 1840, 1845S, 21E SERIES 3, 221E SERIES 3.

Frequently asked questions

What is the part number?

The manufacturer part number is 88871.

Is this a genuine OEM part?

Yes. Southeastern Equipment stocks OEM and quality aftermarket parts for heavy equipment. Contact us if you need a specific OEM source or aftermarket option.

Will this fit my machine?

See the compatible equipment list above. If your model is not listed, call us with your machine's serial number and we can confirm.

Where does this ship from?

Southeastern Equipment Company ships parts nationwide from our US warehouse. Orders placed before 2 PM ET typically ship same day.

Ships nationwide. In-stock parts ordered before 2:30 PM ET ship the same business day. Your exact shipping cost and delivery estimate are calculated at checkout from your ZIP code and the part’s size and weight; oversized and truck-freight items may need extra transit time and freight charges.

Free branch pickup is also available across Ohio, Indiana, Michigan, and Kentucky — just choose it at checkout.

30-day returns. New, unused parts in original packaging may be returned within 30 days. Some items — including electrical, special-order, and direct-from-supplier parts — are non-returnable. See our full return policy.